Thunderbolt USBc ports. MASSIVE 32gb DDR4 ram as standard Single module allow 64gb RAM install. ????32GB DDR4 RAM – Smooth multitasking and responsive performance. 1 BIOS version UEFI Specification 2.7 BIOS features InsydeH2O BIOS Audio type On board Audio codec Realtek ALC255 Audio features 2x built-in speakers (stereo) MIL-STD tested Yes, selected MIL-STD-810H tests passed.